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Circling back to post the resolution. I was afraid that the block was cracked, but was hoping that it was the freeze plugs. A quick survey of mechanics that have worked on Nissans suggested there was about a 50/50 chance. Had to take it to 3 different shops, but finally got the tranny out and it was the freeze plugs after all. But once they fixed that and ...


You also need to check the coolant tank if it has one, it may have a leak or the connecting hose has a leak, and when the water in the radiator expands, it's lost to the leak.


You want to make sure you do not put tap water into the cooling system on your vehicle. The cooling system has a leak, which is why you need to refill it periodically. Look on the ground where you park and note any wet spots. Check all the hoses to and from your radiator for any signs of a leak such as wet fluid or runny looking patches of evaporated fluid ...


It's been a while since I've seen one of these engines. IIRC There's a water pipe that runs through the engine V and connects to the heater hose at the rear of the engine. One of these is true. The pipe is rotted The hose clamp failed The hose failed A freeze plug failed

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